That is when the rate went up to 41 cents from 39.
It was increased from 39 cents to 41 cents on 14 May 2007.
The postage rate changed in May 2007. It was raised from 391 cents to 41 cents on May 7th. The second ounce of postage was reduced to 17 cents..
For 2009, the cost of a postage stamp started at $0.42. Starting May 11, 2009, the cost of a postage stamp rose to $0.44. The cost of postage stamps started May 11, 2009 per ounce was $0.44 each additional ounce was $0.17 and postcards were $0.28.
It was $0.39 cents until May 14, 2007, then it went up to $0.41 cents. source - http://www.akdart.com/postrate.html
Postage rates in the US are not state dependent. A First Class stamp was 39 cents at the start of 2007. The rate changed in May of 2007 to 41 cents.
44 Cents as of may 2010
The postage rate changed in May 2008. It was raised from 41 cents to 42 cents on May 12th. The second ounce of postage remained at 17 cents.
In the U.S. from 8 January 2006 through 13 May 2007.
60 cents in Australia44 cents in the US
The price of a US First Class Stamp started 2009 at 42 cents. It was good for one ounce of First Class Postage. It went up to 44 cents on May 11th.
1st class postage stamp at this time is .42. (as of May 2008)
US postage for first class letter was 3-cents.